Data Sheet

ManualsBrandsUnbranded ManualsActive ComponentsLinear IC - Audio amplifier LM3886T/NOPB 1-channel (mono) Class AB TO 220 11

LM3886

www.ti.com

SNAS091C –MAY 1999–REVISED MARCH 2013

LM3886 Overture™ Audio Power Amplifier Series

High-Performance 68W Audio Power Amplifier w/Mute

Check for Samples: LM3886

FEATURES

DESCRIPTION

The LM3886 is a high-performance audio power

• 68W Cont. Avg. Output Power into 4Ω at V

amplifier capable of delivering 68W of continuous

±28V

average power to a 4Ω load and 38W into 8Ω with

• 38W Cont. Avg. Output Power into 8Ω at V

0.1% THD+N from 20Hz–20kHz.

±28V

The performance of the LM3886, utilizing its Self

• 50W Cont. Avg. Output Power into 8Ω at V

Peak Instantaneous Temperature (°Ke) (SPiKe)

±35V

protection circuitry, puts it in a class above discrete

• 135W Instantaneous Peak Output Power

and hybrid amplifiers by providing an inherently,

Capability dynamically protected Safe Operating Area (SOA).

SPiKe protection means that these parts are

• Signal-to-Noise Ratio ≥ 92dB

completely safeguarded at the output against

• An Input Mute Function

overvoltage, undervoltage, overloads, including shorts

• Output Protection from a Short to Ground or

to the supplies, thermal runaway, and instantaneous

temperature peaks.

to the Supplies via Internal Current Limiting

Circuitry

The LM3886 maintains an excellent signal-to-noise

• Output Over-Voltage Protection against

ratio of greater than 92dB with a typical low noise

Transients from Inductive Loads

floor of 2.0µV. It exhibits extremely low THD+N

values of 0.03% at the rated output into the rated

• Supply Under-Voltage Protection, not Allowing

load over the audio spectrum, and provides excellent

Internal Biasing to Occur when |V

| + |V

| ≤

linearity with an IMD (SMPTE) typical rating of

12V, thus Eliminating Turn-On and Turn-Off

0.004%.

Transients

• 11-Lead TO-220 Package

• Wide Supply Range 20V - 94V

APPLICATIONS

• Component stereo

• Compact stereo

• Self-powered speakers

• Surround-sound amplifiers

• High-end stereo TVs

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2Overture is a trademark of dcl_owner.

3All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (31 pages)

PAGE 1
LM3886 www.ti.com SNAS091C – MAY 1999 – REVISED MARCH 2013 LM3886 Overture™ Audio Power Amplifier Series High-Performance 68W Audio Power Amplifier w/Mute Check for Samples: LM3886 FEATURES DESCRIPTION • The LM3886 is a high-performance audio power amplifier capable of delivering 68W of continuous average power to a 4Ω load and 38W into 8Ω with 0.1% THD+N from 20Hz–20kHz. 1 23 • • • • • • • • • • 68W Cont. Avg. Output Power into 4Ω at VCC = ±28V 38W Cont. Avg.
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LM3886 SNAS091C – MAY 1999 – REVISED MARCH 2013 www.ti.com Typical Application *Optional components dependent upon specific design requirements. Refer to External Components Description for a component functional description. Figure 1. Typical Audio Amplifier Application Circuit Connection Diagram Top View Preliminary: call your local Texas Instruments Sales Rep. or distributor for availability Figure 2.
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LM3886 www.ti.com SNAS091C – MAY 1999 – REVISED MARCH 2013 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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LM3886 SNAS091C – MAY 1999 – REVISED MARCH 2013 Electrical Characteristics www.ti.com (1) (2) The following specifications apply for V+ = +28V, V− = −28V, IMUTE = −0.5 mA with RL = 4Ω unless otherwise specified. Limits apply for TA = 25°C.
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LM3886 www.ti.
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LM3886 SNAS091C – MAY 1999 – REVISED MARCH 2013 www.ti.com Single Supply Application Circuit *Optional components dependent upon specific design requirements. Refer to the External Components Description for a component functional description. Figure 3.
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LM3886 www.ti.
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LM3886 SNAS091C – MAY 1999 – REVISED MARCH 2013 www.ti.com (excluding active protection circuitry) External Components Description (See Figure 1 and Figure 3) Components Functional Description 1. RIN Acts as a volume control by setting the voltage level allowed to the amplifier's input terminals. 2. RA Provides DC voltage biasing for the single supply operation and bias current for the positive input terminal. 3. CA Provides bias filtering. 4.
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LM3886 www.ti.com SNAS091C – MAY 1999 – REVISED MARCH 2013 Typical Performance Characteristics Safe Area SPiKe Protection Response Figure 4. Figure 5. Supply Current vs Supply Voltage Pulse Thermal Resistance Figure 6. Figure 7. Pulse Thermal Resistance Supply Current vs Output Voltage Figure 8. Figure 9.
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LM3886 SNAS091C – MAY 1999 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) 10 Pulse Power Limit Pulse Power Limit Figure 10. Figure 11. Supply Current vs Case Temperature Input Bias Current vs Case Temperature Figure 12. Figure 13. Clipping Voltage vs Supply Voltage Clipping Voltage vs Supply Voltage Figure 14. Figure 15.
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LM3886 www.ti.com SNAS091C – MAY 1999 – REVISED MARCH 2013 Typical Performance Characteristics (continued) THD + N vs Frequency THD + N vs Frequency Figure 16. Figure 17. THD + N vs Frequency THD + N vs Output Power Figure 18. Figure 19. THD + N vs Output Power THD + N vs Output Power Figure 20. Figure 21.
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LM3886 SNAS091C – MAY 1999 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) 12 THD + N vs Output Power THD + N vs Output Power Figure 22. Figure 23. THD + N vs Output Power THD + N vs Output Power Figure 24. Figure 25. THD + N vs Output Power THD + N vs Output Power Figure 26. Figure 27.
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LM3886 www.ti.com SNAS091C – MAY 1999 – REVISED MARCH 2013 Typical Performance Characteristics (continued) THD + N Distribution THD + N Distribution Figure 28. Figure 29. THD + N Distribution THD + N Distribution Figure 30. Figure 31. THD + N Distribution Output Power vs Load Resistance Figure 32. Figure 33.
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LM3886 SNAS091C – MAY 1999 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) Max Heatsink Thermal Resistance (°C/W) at the Specified Ambient Temperature (°C) Maximum Power Dissipation vs Supply Voltage Note: The maximum heat sink thermal resistance values, øSA, in the table above were calculated using a øCS = 0.2°C/W due to thermal compound. Figure 34. 14 Power Dissipation vs Output Power Power Dissipation vs Output Power Figure 35. Figure 36.
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LM3886 www.ti.com SNAS091C – MAY 1999 – REVISED MARCH 2013 Typical Performance Characteristics (continued) IMD 60 Hz, 7 kHz, 4:1 IMD 60 Hz, 7 kHz, 4:1 Figure 39. Figure 40. IMD 60 Hz, 1:1 IMD 60 Hz, 7 kHz 1:1 Figure 41. Figure 42. IMD 60 Hz, 7 kHz, 1:1 Mute Attenuation vs Mute Current Figure 43. Figure 44.
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LM3886 SNAS091C – MAY 1999 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) Mute Attenuation vs Mute Current Large Signal Response Figure 45. Figure 46. Power Supply Rejection Ratio Common-Mode Rejection Ratio Figure 47. Figure 48. Open Loop Frequency Response Figure 49.
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LM3886 www.ti.com SNAS091C – MAY 1999 – REVISED MARCH 2013 APPLICATION INFORMATION GENERAL FEATURES Mute Function: The muting function of the LM3886 allows the user to mute the music going into the amplifier by drawing less than 0.5 mA out of pin 8 of the device. This is accomplished as shown in the Typical Application Circuit where the resistor RM is chosen with reference to your negative supply voltage and is used in conjuction with a switch.
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LM3886 SNAS091C – MAY 1999 – REVISED MARCH 2013 www.ti.com As a benefit to the system designer we have provided Figure 34 for various loads in Typical Performance Characteristics, giving an accurate figure for the maximum thermal resistance required for a particular amplifier design. This data was based on θJC = 1°C/W and θCS = 0.2°C/W. We also provide a section regarding heat sink determination for any audio amplifier design where θCS may be a different value.
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LM3886 www.ti.com SNAS091C – MAY 1999 – REVISED MARCH 2013 Referring to the figure below, it is seen that the thermal resistance from the die (junction) to the outside air (ambient) is a combination of three thermal resistances, two of which are known, θJC and θCS.
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LM3886 SNAS091C – MAY 1999 – REVISED MARCH 2013 www.ti.com NOTE CCIR/ARM: A Practical Noise Measurement Method; by Ray Dolby, David Robinson and Kenneth Gundry, AES Preprint No. 1353 (F-3). In addition to noise filtering, differing meter types give different noise readings. Meter responses include: 1. RMS reading, 2. average responding, 3. peak reading, and 4. quasi peak reading.
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LM3886 www.ti.com SNAS091C – MAY 1999 – REVISED MARCH 2013 LAYOUT, GROUND LOOPS AND STABILITY The LM3886 is designed to be stable when operated at a closed-loop gain of 10 or greater, but as with any other high-current amplifier, the LM3886 can be made to oscillate under certain conditions. These usually involve printed circuit board layout or output/input coupling.
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LM3886 SNAS091C – MAY 1999 – REVISED MARCH 2013 www.ti.com The single-point ground concept should be applied rigorously to all components and all circuits when possible. Violations of single-point grounding are most common among printed circuit board designs, since the circuit is surrounded by large ground areas which invite the temptation to run a device to the closest ground spot. As a final rule, make all ground returns low resistance and low inductance by using large wire and wide traces.
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LM3886 www.ti.com SNAS091C – MAY 1999 – REVISED MARCH 2013 The desired input impedance is set by RIN. Very high values can cause board layout problems and DC offsets at the output. The value for the feedback resistance, Rf1, should be chosen to be a relatively large value (10 kΩ–100 kΩ), and the other feedback resistance, Ri, is calculated using standard op amp configuration gain equations. Most audio amplifiers are designed from the non-inverting amplifier configuration.
PAGE 24
LM3886 SNAS091C – MAY 1999 – REVISED MARCH 2013 www.ti.com for which the amplifier is operational. Note that the specifications are not specified over the full commonmode voltage range unless specifically stated. Common-Mode Rejection: The ratio of the input common-mode voltage range to the peak-to-peak change in input offset voltage over this range. Power Supply Rejection: The ratio of the change in input offset voltage to the change in power supply voltages producing it.
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LM3886 www.ti.com SNAS091C – MAY 1999 – REVISED MARCH 2013 The DC thermal resistance applies when one output transistor is operating continuously. The AC thermal resistance applies with the output transistors conducting alternately at a high enough frequency that the peak capability of neither transistor is exceeded. Power Bandwidth: The power bandwidth of an audio amplifier is the frequency range over which the amplifier voltage gain does not fall below 0.
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LM3886 SNAS091C – MAY 1999 – REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Revision B (March 2013) to Revision C • 26 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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MECHANICAL DATA NDA0011B TF11B (Rev D) www.ti.
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MECHANICAL DATA NDJ0011B TA11B (Rev B) www.ti.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.